IV.D47 — Level 0 Formula

R₀ = ι_τ^(-7) − √3·ι_τ^(-2). Level 0 mass ratio formula. Correction √3·ι_τ^(-2) ∈ (14, 16). At exact ι_τ: 7.7 ppm accuracy. At 6-digit approx: R₀ ∈ (1831, 1836).